The interstellar medium local to HD 10125

• Autores: Cichowolski, Silvina; Arnal, Edmundo Marcelo; Cappa, Cristina Elisabet; Pineault, Serge; St-Louis, N.
• Año de publicación: 2003
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Ciencias Astronómicas; H II regions; Infrared: ISM; ISM: bubbles; Stars: individual: HD 10125
• Institución: Universidad Nacional de La Plata

Based on an H I line and 408- and 1420-MHz radio continuum survey carried out at the Dominion Radio Astrophysical Observatory (DRAO), the environment of the O star HD 10125 has been studied. In addition, complementary radio continuum images, as well as infrared data of the same region have been analysed. An arc-like structure is found in all the radio continuum data. From the 21 -cm line data, an H I minimum is found in the velocity range ‒27 to ‒32kms^-1. Although HD 10125 is not at the centre of the H I cavity, its eccentric position is consistent with the observed stellar proper motion. The H I cavity and the continuum arc-like structure show an excellent morphological correlation. The radio continuum emission has a spectral index (S_v ∼ v^α) α = 0.0 ± 0.1, which establishes the thermal nature of the arc-like feature. The dust temperature obtained from the infrared data is higher in the area where the continuum emission is present. A distance of 3 kpc is derived for the star, the H I cavity and the radio continuum structure. We conclude that all the features we have found are physically related to each other. The O star has enough energetic photons to both ionize the surrounding gas and heat up the dust and, through its powerful wind, also sweep up the H I and H II gas.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto Argentino de Radioastronomía